Lameness caused by inflammation in the distal hock.

This research investigates the primary causes of lameness in horses, analyzing the key differences between those ridden at a gallop and those used as harness horses. It was found that osteoarthritis or bone spavin is caused primarily by impact and compression on the distal tarsal bones during a gallop, while differing stresses occurring in the same region were identified as the likely cause of a common issue in Standardbreds.

What Causes Lameness in Horses?

In this research, the focus was on understanding the root causes of lameness, a condition impairing the ability of a horse to move, in different breeds of horses. They analyzed two types of horses:

• Horses ridden at a gallop
• Harness horses which include Standardbred pacers and trotters

The authors observed a higher incidence of bone spavin, a form of osteoarthritis, in horses ridden at a gallop. They ascertained that this condition arises due to continuous impact and compression on the distal tarsal bones during a gallop, where it occurs the most forcefully.

Standardbreds and Their Unique Syndrome

Standardbreds, on the other hand, were found to have a different syndrome contributing to lameness. The researchers suggested that the interaction of shear stresses, which occur in the joint between distal tarsal bones, are most severe at the trot or pace. They believed these forces are likely responsible for a common problem known as cunean-tarsitis found in Standardbreds.

Gait and Force Interactions

The detailed analysis and comparison of these two types of horses and the primary factors leading to lameness led to the conclusion that each gait, whether a gallop, pace, or trot, results in distinctive stresses and forces on the horses’ joints and bones. These specific force interactions appear to contribute significantly to various health issues, leading to different manifestations of lameness in each breed. In short, the type of gait a horse is predominantly used for can influence the kind of lameness it may develop.